Huygens touched down on Titan's frigid surface on Jan. 14, 2005, three weeks after separating from the Cassini mothership. It was a landmark moment in planetary science, mission team members said.
"The Huygens descent and landing represented a major breakthrough in our exploration of Titan as well as the first soft landing on an outer-planet moon," Cassini project scientist Linda Spilker, of NASA's Jet Propulsion Laboratory in Pasadena, California, said in a statement. "It completely changed our understanding of this haze-covered ocean world." [Huygens Probe's Titan Landing Revisited 12 Years Later (Video)]